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Extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of anti-seismic refractory steel plate and its manufacturing, can solve the problems of high cost and no hot-rolled extra-thick refractory steel, etc., and achieve the goal of improving high-temperature performance, excellent comprehensive performance, and improving performance pass rate Effect

Inactive Publication Date: 2021-08-06
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional refractory steel is designed with high Mo (generally not less than 0.5wt.%) composition, and the strong high-temperature solid-solution strengthening effect of Mo element is used to meet the loss of high-temperature strength. However, Mo element is relatively expensive and makes the cost of steel greatly increase
In addition, there is no industrial application of hot-rolled extra-thick refractory steel technology

Method used

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  • Extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and manufacturing method thereof
  • Extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and manufacturing method thereof
  • Extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The yield strength 390MPa grade 100mm extra-thick anti-seismic refractory steel plate of Example 1 has the mass percentages of each element in its chemical composition: C: 0.048%, Si: 0.31%, Mn: 0.55%, P: 0.008%, S: 0.003%, Cr: 0.38%, Mo: 0.17%, Nb: 0.037%, V: 0.061%, Ti: 0.015%, Al: 0.031%, N: 0.004%, and the balance is Fe and unavoidable impurity elements.

[0021] Its manufacturing method comprises the following process steps:

[0022] Steelmaking and continuous casting process: target sulfur content of molten iron is 0.010% after desulfurization; converter smelting adopts high-blown low-drawing method for dephosphorization, and converter taps steel as slag; refining adopts white slag operation, white slag retention time is 19 minutes, and the total refining time is 46 minutes. During the process, alloys are added sequentially in the order of Ti, Cr, Mo, Nb and V to adjust the composition of molten steel to the target composition; the vacuum treatment is kept for 22 ...

Embodiment 2

[0026] The yield strength 390MPa grade 100mm extra-thick anti-seismic refractory steel plate of Example 2 has the mass percentages of the elements of the chemical composition: C: 0.062%, Si: 0.42%, Mn: 0.76%, P: 0.010%, S: 0.002%, Cr: 0.45%, Mo: 0.13%, Nb: 0.032%, V: 0.065%, Ti: 0.022%, Al: 0.023%, N: 0.004%. The balance is Fe and unavoidable impurity elements.

[0027] Its manufacturing method comprises the following process steps:

[0028] (1) The target sulfur content after desulfurization of molten iron is 0.008%; converter smelting adopts high-blown low-drawing method for dephosphorization, and converter taps steel as slag; refining adopts white slag operation, white slag retention time is 22 minutes, and the total refining time is guaranteed to be 40 minutes. Add alloys in the order of Ti, Cr, Mo, Nb and V to adjust the composition of molten steel to the target composition; hold the vacuum treatment for 20 minutes; after the vacuum treatment, perform the treatment of fe...

Embodiment 3

[0032] The steel plate of embodiment 3, its chemical composition each element mass percent is: C: 0.071%, Si: 0.28%, Mn: 0.46%, P: 0.009%, S: 0.004%, Cr: 0.53%, Mo: 0.16%, Nb: 0.044%, V: 0.041%, Ti: 0.017%, Al: 0.019%, N: 0.004%. The balance is Fe and unavoidable impurity elements.

[0033] Its manufacturing method comprises the following process steps:

[0034] (1) The target sulfur content after desulfurization of molten iron is 0.011%; converter smelting adopts high-blowing and low-drawing method for dephosphorization, and converter is tapped as slag; refining adopts white slag operation, white slag retention time is 16 minutes, and the total refining time is guaranteed to be 40 minutes. Add alloys in sequence according to the order of Ti, Cr, Mo, Nb and V, adjust the composition of molten steel to the target composition; keep the time of vacuum treatment for 25 minutes; after the vacuum treatment, perform the treatment of feeding pure calcium wire; the temperature of the ...

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Abstract

The invention discloses an extra-thick anti-seismic fire-resistant steel plate with yield strength of 390MPa and a manufacturing method thereof. The steel plate adopts a low-molybdenum and niobium-vanadium-added component design thought, the cost of steel is effectively reduced through the low-molybdenum design, the high-temperature performance is improved through synergistic precipitation strengthening of niobium and vanadium at high temperature, meanwhile, a certain amount of bainite structures are generated by the steel through controlled rolling and controlled cooling means, the high-temperature strength of the steel is regulated and controlled through the good high-temperature performance of bainite, the rolling mode is hot mechanical rolling, the production cost is reduced, compared with existing refractory steel for high-rise buildings, the steel is more economical and practical, meanwhile, the anti-seismic fire-resistant steel plate with the thickness of 100mm has important significance on development of super high-rise and large-span green steel structure buildings, and no related patent and report special for the hot-rolled extra-thick fire-resistant steel exists at present, so that the anti-seismic fire-resistant steel plate has great application prospects and economic benefits.

Description

technical field [0001] The invention relates to an anti-seismic fire-resistant steel plate and a manufacturing method thereof, in particular to an extra-thick anti-seismic fire-resistant steel plate with a yield strength of 390 MPa and a manufacturing method thereof. Background technique [0002] The construction of super high-rise and long-span steel structure buildings has entered a period of rapid development. With the increasing height and span of steel structure buildings, higher requirements are put forward for the strength and thickness of building structural steel. Steel plates with a yield strength of 235MPa and 345MPa can no longer meet the development needs of steel structure buildings. With the vigorous development of steel structure buildings, it has greatly promoted the development of steel for building structures in the direction of high strength and large thickness. [0003] The fire resistance of ordinary building steel is very poor. As the temperature rise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/26C22C38/24C22C38/06C22C38/04C22C38/02C22C33/04C21D8/02
CPCC21D8/0205C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28
Inventor 孟令明崔强陈林恒邓伟
Owner NANJING IRON & STEEL CO LTD
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